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* distributed with this work for additional information
* regarding copyright ownership. The ASF licenses this file
* to you under the Apache License, Version 2.0 (the
* "License"); you may not use this file except in compliance
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*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing,
* software distributed under the License is distributed on an
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* KIND, either express or implied. See the License for the
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package org.apache.cayenne.access;
import org.apache.cayenne.CayenneRuntimeException;
import org.apache.cayenne.DataObject;
import org.apache.cayenne.ObjectId;
import org.apache.cayenne.Persistent;
import org.apache.cayenne.graph.GraphChangeHandler;
import org.apache.cayenne.graph.GraphManager;
import org.apache.cayenne.map.ObjEntity;
import org.apache.cayenne.map.Relationship;
/**
* A GraphChangeHandler that loads child ObjectContext diffs into a parent DataContext.
* Graph node ids are expected to be ObjectIds.
*
* @since 1.2
* @author Andrus Adamchik
*/
class ChildDiffLoader implements GraphChangeHandler {
DataContext context;
GraphManager graphManager;
ChildDiffLoader(DataContext context) {
this.context = context;
this.graphManager = context.getGraphManager();
}
public void nodeIdChanged(Object nodeId, Object newId) {
throw new CayenneRuntimeException("Not supported");
}
public void nodeCreated(Object nodeId) {
ObjectId id = (ObjectId) nodeId;
if (id.getEntityName() == null) {
throw new NullPointerException("Null entity name in id " + id);
}
ObjEntity entity = context
.getEntityResolver()
.lookupObjEntity(id.getEntityName());
if (entity == null) {
throw new IllegalArgumentException("Entity not mapped with Cayenne: " + id);
}
DataObject dataObject = null;
try {
dataObject = (DataObject) entity.getJavaClass().newInstance();
}
catch (Exception ex) {
throw new CayenneRuntimeException("Error instantiating object.", ex);
}
dataObject.setObjectId(id);
context.registerNewObject(dataObject);
}
public void nodeRemoved(Object nodeId) {
Persistent object = findObject(nodeId);
context.deleteObject(object);
}
public void nodePropertyChanged(
Object nodeId,
String property,
Object oldValue,
Object newValue) {
// this change is for simple property, so no need to convert targets to server
// objects...
DataObject object = findObject(nodeId);
try {
object.writeProperty(property, newValue);
}
catch (Exception e) {
throw new CayenneRuntimeException("Error setting property: " + property, e);
}
}
public void arcCreated(Object nodeId, Object targetNodeId, Object arcId) {
DataObject source = findObject(nodeId);
// find whether this is to-one or to-many
ObjEntity sourceEntity = context.getEntityResolver().lookupObjEntity(source);
Relationship relationship = sourceEntity.getRelationship(arcId.toString());
DataObject target = findObject(targetNodeId);
if (relationship.isToMany()) {
source.addToManyTarget(relationship.getName(), target, false);
}
else {
source.setToOneTarget(relationship.getName(), target, false);
}
}
public void arcDeleted(Object nodeId, Object targetNodeId, Object arcId) {
DataObject source = findObject(nodeId);
// find whether this is to-one or to-many
ObjEntity sourceEntity = context.getEntityResolver().lookupObjEntity(source);
Relationship relationship = sourceEntity.getRelationship(arcId.toString());
DataObject target = findObject(targetNodeId);
if (relationship.isToMany()) {
source.removeToManyTarget(relationship.getName(), target, false);
}
else {
source.setToOneTarget(relationship.getName(), null, false);
}
}
DataObject findObject(Object nodeId) {
return (DataObject) graphManager.getNode(nodeId);
}
}